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    <p>There's no benefit or choice, really - one <code>ServiceHost</code> (instance of that class) can host exactly one service, and for each service, you need a separate service host. It's a 1:1 mapping - always, no choice.</p> <p>But of course, your Windows NT service or console app can have multiple <code>ServiceHost</code> objects active at the same time. This can be useful if you have a set of services that logically belong together and can't really exist without one another - where it doesn't make sense to have one of them started and another one not started.</p> <p>And yes, a service host can host a service which exposes multiple endpoints, and multiple clients can connect on those separate endpoints at the same time, no problem. The WCF runtime will spin up a number of worker threads to handle incoming requests (you can limit those with the ServiceThrottling behavior) independently of each other.</p> <hr> <p>To set up and control, how many concurrent calls and requests you have, you'll need to look at the ServiceThrottling behavior on the server side.</p> <pre><code>&lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior name="serviceThrottled"&gt; &lt;serviceThrottling maxConcurrentCalls="16" maxConcurrentInstances="26" maxConcurrentSessions="10"/&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; </code></pre> <p>and you need to reference that service behavior configuration in your service declaration, of course:</p> <pre><code>&lt;service name="YourService" behaviorConfiguration="serviceThrottled"&gt; ..... &lt;/service&gt; </code></pre> <p>These are the default values. The explanations are as follows (taken from Dan Rigsby's blog post, shortened):</p> <ul> <li><p><strong>MaxConcurrentCalls</strong> (default = 16) [Per-message] The maximum number of messages that can actively be processed. </p></li> <li><p><strong>MaxConcurrentInstances</strong> (default = 26) The maximum number of InstanceContext objects in a service that can execute at one time. For per-session service, this is equal to the maximum number of sessions, for per-call service, it's the maximum number of concurrent calls, and for singletons, it's pointless.</p></li> <li><p><strong>MaxConcurrentSessions</strong> (default = 10) [Per-channel] The maximum number of sessions that a service can accept at one time. Only comes into play with session-based bindings (wsHttp or netTcp) </p></li> </ul> <p>Definitely also check out <a href="http://www.danrigsby.com/blog/index.php/2008/02/20/how-to-throttle-a-wcf-service-help-prevent-dos-attacks-and-maintain-wcf-scalability/" rel="noreferrer">Dan Rigsby's excellent blog post</a> on the topic.</p>
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    1. POWhat are the benefits for several servicehosts? Does one ServiceHost support several simultaneous connections on one endpoint?
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    1. POWhat are the benefits for several servicehosts? Does one ServiceHost support several simultaneous connections on one endpoint?
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    1. CONo, situation I'm interested in is when I have one logical service with one endpoint, but I need multiple simultaneous connection to the service from multiple clients (though, using one type of endpoint).
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    2. CO@flashnik: that's definitely no problem. By default, 10-16 concurrent calls are possible on the service, no matter which endpoint they come in on
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    3. COCould you please explain how I can vary this amount?
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